Ключевые слова: cart, deep, digging, drilling, earth, earthwork, excavation, excavation site, extraction, extraction site, geology, industrial, industrial site, labor, labor force, laborers, laborintensive, machinery, minerals, mining, mining equipment, mining site, mining tools, operation, power, power tools, resources, rocks, safety gear, shaft, stones, technology, tools, tunnel, tunnel system, underground, workers, workers safety, worksite,